Which production role belongs to red bone marrow, the blood-forming tissue inside certain bones?
It makes hormones but never blood cells.
It produces only red blood cells and no other formed elements.
It produces red blood cells, many white blood cells, and platelets.✓الإجابة الصحيحة
It converts yellow cartilage into every blood component.
الشرح
Red bone marrow produces red blood cells, many kinds of white blood cells, and platelets. Cartilage does not perform this blood-cell-forming role, so replacing marrow with yellow cartilage would identify the wrong tissue.